South Carolina–based Vapor Apparel, a provider of digital print-on-demand services and performance apparel manufacturing, saw sales rise by 30 percent in 2014 and company management projects another 20 percent in 2015.

Los Angeles–based STC-QST supplies products that provide the foundation of a garment, such as interlining, pocketing, shoulder pads and zippers. When STC-QST Chief Executive Officer Brian Weitman quietly launched a sourcing division 15 years ago, he began providing support for growing apparel makers and brands.